198685 has 8 divisors (see below), whose sum is σ = 241920. Its totient is φ = 156624.

The previous prime is 198673. The next prime is 198689. The reversal of 198685 is 586891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198685 - 2⁹ = 198173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144 + ... + 646.

It is an arithmetic number, because the mean of its divisors is an integer number (30240).

2¹⁹⁸⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

198685 is a deficient number, since it is larger than the sum of its proper divisors (43235).

198685 is an equidigital number, since it uses as much as digits as its factorization.

198685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587.

The product of its digits is 17280, while the sum is 37.

The square root of 198685 is about 445.7409561618. The cubic root of 198685 is about 58.3519033848.

The spelling of 198685 in words is "one hundred ninety-eight thousand, six hundred eighty-five".